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DEBT - NARRATIVE (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 CAD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 CAD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2018 CAD ($) | Dec. 31, 2017 CAD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |
Commitment fee percentage |  |  |  |  | 0.20% |
Long-term debt | $ 58,707,000,000 |  |  |  | $ 58,707,000,000 | $ 60,865,000,000
Long-term debt, fair value adjustment |  |  |  |  | 975,000,000 |
Amortization of fair value adjustment | 23,000,000 |  |  |  | 112,000,000 |
Uncommitted demand credit facilities |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Amount of credit facility | 790,000,000 |  |  |  | 790,000,000 | 792,000,000
Unutilized amount of facility | 564,000,000 |  |  |  | 564,000,000 | 518,000,000
Commercial paper and credit facility draws |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Long-term debt | 7,534,000,000 |  |  |  | 7,534,000,000 | 10,055,000,000
Enbridge (U.S.) Inc. |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Extinguishment of debt |  | $ 500 |  | $ 950 |  |
Westcoast Energy Inc |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Extinguishment of debt |  |  | $ 400,000,000 |  |  |
Enbridge Inc. |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Extinguishment of debt |  | $ 100 |  | $ 650 |  |
Subordinated Debt | Fixed To Floating Subordinated Term Notes |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Subordinated debt | $ 7,053,000,000 |  |  |  | $ 7,053,000,000 | $ 4,344,000,000

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